Spike helmet



FIG. 1 is a front perspective view of spike helmet showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1-7 are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a spike helmet, as shown and described. 